Our Gro1 CO2 Regulator (DUAL) is the perfect tool to help you control and maintain your optimum CO2 levels for your plants. It has an easy-to-adjust flow meter (adjustable to 0.5 - 15 cubit feet per hour), a pre-set regulator, and a solenoid valve. Easily attach the included tubing to a fan for even CO2 distribution throughout your grow room. Includes a 6 ft long 120V power cord, 5 meters of 1/4” black tubing, and 2 white washers.